بررسی توانایی حذف نیترات از محلول آبی به وسیله جاذب‌های گیاهی در شرایط آزمایشگاهی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 آبیاری و زهکشی دانشگاه علوم کشاورزی منابع طبیعی ساری

2 گروه مهندسی آب، دانشگاه علوم کشاورزی و منابع طبیعی ساری

3 گروه خاکشناسی دانشگاه علوم کشاورزی و منابع طبیعی ساری

4 گروه مهندسی آب دانشگاه علوم کشاورزی و منابع طبیعی ساری

چکیده

چکیده
نیترات موجود در پساب از مهم­ترین آلاینده­هاست که در اثر استفاده از کودهای ازته به­وجود می­آید. افزایش غلظت نیترات می‌تواند منجربه بیماری‌های مختلفی در انسان و حیوانات شود. روش­های مختلفی برای حذف نیترات از آب وجود دارد که هرکدام ازاین‌روش­ها هزینه بالایی دارند. ازاین‌رو در این تحقیق سعی شده تا کارایی حذف نیترات به وسیله ضایعات کشاورزی ارزان قیمت مورد بررسی قرار گیرد. این پژوهش در آزمایشگاه آبیاری دانشگاه علوم کشاورزی و منابع طبیعی ساری انجام شد. در این آزمایشات عواملی همچون زمان تعادل، pH، مقدار جاذب و مدل­های جذب لانگمویر و فرندلیچ مورد مطالعه قرار گرفت. زمان تعادل برای پوسته برنج، خاک اره و کاه گندم به ترتیب برابر با 60، 30و 60 دقیقه بدست آمد و برای هر سه جاذب کاهش pH منجربه افزایش کارایی حذف نیترات شد و pH بهینه برابر 3 به­دست آمد. همچنین با افزایش مقدار جاذب­، مقدار جذب ابتدا افزایش و سپس کاهش یافته و مقدار جاذب بهینه برابر 5/2 گرم بر لیتر محاسبه شد. همچنین بررسی­ها نشان داد برای هر 3 جاذب پوسته برنج، خاک اره و کاه گندم، مدل لانگمویر داده­ها را بهتر از مدل فرندلیچ برازش می­دهد و حداکثر مقدار جذب به ترتیب 43/7 ،73/10 و 52/6 میلی­گرم بر گرم محاسبه شده است.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation on Potential of Nitrate Removal in the Aqueous Solution by using plant adsorbants(Rice husk, sawdust and wheat straw)in laboratory condition

نویسندگان [English]

  • Ashkan Hashemi 1
  • Ali Shahnazari 2
  • Fardin Sadeghzadeh 3
  • Kaveh khanlari 4
2 Associate Professor, Water Engineering Department, Sari Agricultural Sciences and Natural Resources University, Sari, Iran. Email
3 Assistant Professor, Sari Agricultural Sciences and Natural Resources University
4 Instructor, Sari Agricultural Sciences and Natural Resources University
چکیده [English]

Abstract
Agricultural waste water are one of  the most significant environmental pollutant sources. Nitrate ion in the wastewater is the most important pollutants that arise from using of nitrogen fertilizers. Increasing concentration of Nitrate can lead to various diseases in humans and animals. Lots of methods use for removing nitrate from water that are expensive. Hence, this study aimed at evaluating of nitrate removal by using low-cost agricultural waste. Also this survey is done with a discontinuing system in irrigation laboratory at Sari Agricultural Sciences and Natural Resources University. In this experiment some factors, such as balance time, optimum pH, optimum mass of adsorbent and Langmuier and Freundlich models were investigated. The results showed that the equilibrium time for rice husk, sawdust and wheat straw are 60, 30 and 60 minutes respectively and for each 3 absorbents decreasing PH lead to increase of nitrate removal efficiency and optimum value for pH occurred at 3. Also, by increasing mass of adsorbent, initial adsorption increased and then decreased and for two optimized absorbents calculated 2.5mg/lit. Finally investigations showed that for each three absorbents include; rice husk, sawdust and wheat straw, adsorption amount is matched with Langmuir model rather than Freundlich model and maximum absorption calculated 7.43, 10.73 and 6.52mg/lit respectively.
 

کلیدواژه‌ها [English]

  • Keywords:Adsorption isotherms
  • Waste water
  • Rice husk
  • Sawdust
  • Wheat straw

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